At 4/15/2006 21:14, you wrote:
>Rob,
>
>This topic has been covered repeatedly on the repeater-builder list, but
>apparently not so often on this list, so I'll summarize the postings.
>
>It is definitely necessary to send the channel element in for re-crystaling.
I disagree with this statement. 5 PPM is fairly easy to achieve via simple
crystal replacement, which you can do yourself. Occasionally you'll run
into an element that was compensated for a crystal with an "extreme" curve,
& your crystal's curve will significantly mismatch that curve. In that
case, you can send the Icom in or simply try a different Icom.
> When you order a bare crystal, intending to install it in a channel
> element that has been previously compensated, it will *not* maintain 5 ppm.
Not true. In most (not all) cases, it will. That's been my experience in
working with Mastr IIs over the years.
If you want guaranteed 2 or 5 PPM accuracy, by all means send the Icoms in
for installation & compensation. At the prices ICM charges for this
service nowdays (~$100/pair I'm told), it might be worth considering the
cheaper alternative.
Bob NO6B
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